package testing

import (
	"context"
	"fmt"
	"sync"
	"time"

	"github.com/google/uuid"
)

// TestStatus represents the status of a test
type TestStatus string

const (
	TestStatusPending TestStatus = "PENDING"
	TestStatusRunning TestStatus = "RUNNING"
	TestStatusPassed  TestStatus = "PASSED"
	TestStatusFailed  TestStatus = "FAILED"
	TestStatusBlocked TestStatus = "BLOCKED"
	TestStatusSkipped TestStatus = "SKIPPED"
)

// TestSeverity represents the severity level
type TestSeverity string

const (
	SeverityBlocker  TestSeverity = "BLOCKER"
	SeverityCritical TestSeverity = "CRITICAL"
	SeverityMajor    TestSeverity = "MAJOR"
	SeverityMinor    TestSeverity = "MINOR"
)

// TestType represents the type of test
type TestType string

const (
	TestTypeFunctional   TestType = "FUNCTIONAL"
	TestTypePerformance  TestType = "PERFORMANCE"
	TestTypeSecurity     TestType = "SECURITY"
	TestTypeIntegration  TestType = "INTEGRATION"
	TestTypeVerification TestType = "VERIFICATION"
)

// TestPlanStatus represents the status of a test plan
type TestPlanStatus string

const (
	TestPlanStatusDraft     TestPlanStatus = "DRAFT"
	TestPlanStatusActive    TestPlanStatus = "ACTIVE"
	TestPlanStatusCompleted TestPlanStatus = "COMPLETED"
	TestPlanStatusArchived  TestPlanStatus = "ARCHIVED"
)

// TestCase represents a single test case
type TestCase struct {
	ID          string
	Name        string
	Description string
	Steps       []string
	Type        TestType
	Severity    TestSeverity
	Priority    int
	Tags        []string
	CreatedAt   time.Time
	UpdatedAt   time.Time
	Metadata    map[string]interface{}
}

// TestPlan represents a collection of test cases
type TestPlan struct {
	ID          string
	Name        string
	Description string
	TestCases   []*TestCase
	Status      TestPlanStatus
	CreatedAt   time.Time
	UpdatedAt   time.Time
	Metadata    map[string]string
}

// TestCaseResult represents the result of a test case execution
type TestCaseResult struct {
	ID        string
	TestID    string
	Status    TestStatus
	StartTime time.Time
	EndTime   time.Time
	Duration  time.Duration
	Error     string
	Logs      []string
	Severity  TestSeverity
	Metadata  map[string]interface{}
}

// TestResults represents the results of a test plan execution
type TestResults struct {
	ID        string
	PlanID    string
	Results   []*TestCaseResult
	StartTime time.Time
	EndTime   time.Time
	Duration  time.Duration
}

// Bug represents a bug report
type Bug struct {
	ID          string
	Title       string
	Description string
	Status      string
	Severity    TestSeverity
	Priority    int
	Steps       []string
	CreatedAt   time.Time
	UpdatedAt   time.Time
	AssignedTo  string
	Metadata    map[string]interface{}
}

// QualityMetrics represents quality-related metrics
type QualityMetrics struct {
	ID        string
	Timestamp time.Time
	Metrics   map[string]float64
}

// Manager handles test management and execution
type Manager struct {
	testPlans   map[string]*TestPlan
	testCases   map[string]*TestCase
	testResults map[string]*TestResults
	bugs        map[string]*Bug
	metrics     map[string]*QualityMetrics
	mutex       sync.RWMutex
}

// NewManager creates a new test manager
func NewManager() *Manager {
	return &Manager{
		testPlans:   make(map[string]*TestPlan),
		testCases:   make(map[string]*TestCase),
		testResults: make(map[string]*TestResults),
		bugs:        make(map[string]*Bug),
		metrics:     make(map[string]*QualityMetrics),
	}
}

// CreateTestPlan creates a new test plan
func (m *Manager) CreateTestPlan(plan *TestPlan) error {
	m.mutex.Lock()
	defer m.mutex.Unlock()

	if plan.ID == "" {
		plan.ID = uuid.NewString()
	}

	if _, exists := m.testPlans[plan.ID]; exists {
		return fmt.Errorf("test plan with ID %s already exists", plan.ID)
	}

	plan.CreatedAt = time.Now()
	plan.UpdatedAt = time.Now()
	plan.Status = TestPlanStatusDraft

	m.testPlans[plan.ID] = plan
	return nil
}

// GetTestPlan retrieves a test plan by ID
func (m *Manager) GetTestPlan(id string) (*TestPlan, error) {
	m.mutex.RLock()
	defer m.mutex.RUnlock()

	plan, exists := m.testPlans[id]
	if !exists {
		return nil, fmt.Errorf("test plan with ID %s not found", id)
	}

	return plan, nil
}

// AddTestCase adds a test case to a test plan
func (m *Manager) AddTestCase(planID string, testCase *TestCase) error {
	m.mutex.Lock()
	defer m.mutex.Unlock()

	plan, exists := m.testPlans[planID]
	if !exists {
		return fmt.Errorf("test plan with ID %s not found", planID)
	}

	if testCase.ID == "" {
		testCase.ID = uuid.NewString()
	}

	testCase.CreatedAt = time.Now()
	testCase.UpdatedAt = time.Now()

	m.testCases[testCase.ID] = testCase
	plan.TestCases = append(plan.TestCases, testCase)
	plan.UpdatedAt = time.Now()

	return nil
}

// ExecuteTestPlan executes all test cases in a test plan
func (m *Manager) ExecuteTestPlan(ctx context.Context, planID string) (*TestResults, error) {
	plan, err := m.GetTestPlan(planID)
	if err != nil {
		return nil, err
	}

	results := &TestResults{
		ID:        uuid.NewString(),
		PlanID:    planID,
		StartTime: time.Now(),
		Results:   make([]*TestCaseResult, 0),
	}

	for _, tc := range plan.TestCases {
		result := m.executeTestCase(ctx, tc)
		results.Results = append(results.Results, result)
	}

	results.EndTime = time.Now()
	results.Duration = results.EndTime.Sub(results.StartTime)

	m.mutex.Lock()
	m.testResults[results.ID] = results
	m.mutex.Unlock()

	return results, nil
}

// executeTestCase executes a single test case
func (m *Manager) executeTestCase(ctx context.Context, tc *TestCase) *TestCaseResult {
	result := &TestCaseResult{
		ID:        uuid.NewString(),
		TestID:    tc.ID,
		StartTime: time.Now(),
		Status:    TestStatusRunning,
		Severity:  tc.Severity,
		Logs:      make([]string, 0),
		Metadata:  make(map[string]interface{}),
	}

	// TODO: Implement actual test execution logic
	// This is a placeholder implementation
	time.Sleep(100 * time.Millisecond)
	result.Status = TestStatusPassed

	result.EndTime = time.Now()
	result.Duration = result.EndTime.Sub(result.StartTime)

	return result
}

// CreateBug creates a new bug report
func (m *Manager) CreateBug(bug *Bug) error {
	m.mutex.Lock()
	defer m.mutex.Unlock()

	if bug.ID == "" {
		bug.ID = uuid.NewString()
	}

	if _, exists := m.bugs[bug.ID]; exists {
		return fmt.Errorf("bug with ID %s already exists", bug.ID)
	}

	bug.CreatedAt = time.Now()
	bug.UpdatedAt = time.Now()
	bug.Status = "NEW"

	m.bugs[bug.ID] = bug
	return nil
}

// UpdateBugStatus updates the status of a bug
func (m *Manager) UpdateBugStatus(bugID string, status string) error {
	m.mutex.Lock()
	defer m.mutex.Unlock()

	bug, exists := m.bugs[bugID]
	if !exists {
		return fmt.Errorf("bug with ID %s not found", bugID)
	}

	bug.Status = status
	bug.UpdatedAt = time.Now()
	return nil
}

// GetBug retrieves a bug by ID
func (m *Manager) GetBug(id string) (*Bug, error) {
	m.mutex.RLock()
	defer m.mutex.RUnlock()

	bug, exists := m.bugs[id]
	if !exists {
		return nil, fmt.Errorf("bug with ID %s not found", id)
	}

	return bug, nil
}

// StoreMetrics stores quality metrics
func (m *Manager) StoreMetrics(metrics *QualityMetrics) error {
	m.mutex.Lock()
	defer m.mutex.Unlock()

	if metrics.ID == "" {
		metrics.ID = uuid.NewString()
	}

	metrics.Timestamp = time.Now()
	m.metrics[metrics.ID] = metrics
	return nil
}

// GetMetrics retrieves quality metrics by ID
func (m *Manager) GetMetrics(id string) (*QualityMetrics, error) {
	m.mutex.RLock()
	defer m.mutex.RUnlock()

	metrics, exists := m.metrics[id]
	if !exists {
		return nil, fmt.Errorf("metrics with ID %s not found", id)
	}

	return metrics, nil
}

// GetTestResults retrieves test results by ID
func (m *Manager) GetTestResults(id string) (*TestResults, error) {
	m.mutex.RLock()
	defer m.mutex.RUnlock()

	results, exists := m.testResults[id]
	if !exists {
		return nil, fmt.Errorf("test results with ID %s not found", id)
	}

	return results, nil
}

// CalculateMetrics calculates quality metrics from test results
func (m *Manager) CalculateMetrics(resultsID string) (*QualityMetrics, error) {
	results, err := m.GetTestResults(resultsID)
	if err != nil {
		return nil, err
	}

	metrics := &QualityMetrics{
		ID:        uuid.NewString(),
		Timestamp: time.Now(),
		Metrics:   make(map[string]float64),
	}

	totalTests := len(results.Results)
	if totalTests == 0 {
		return nil, fmt.Errorf("no test results found")
	}

	passed := 0
	failed := 0
	blocked := 0
	skipped := 0

	for _, result := range results.Results {
		switch result.Status {
		case TestStatusPassed:
			passed++
		case TestStatusFailed:
			failed++
		case TestStatusBlocked:
			blocked++
		case TestStatusSkipped:
			skipped++
		}
	}

	metrics.Metrics["total_tests"] = float64(totalTests)
	metrics.Metrics["pass_rate"] = float64(passed) / float64(totalTests)
	metrics.Metrics["fail_rate"] = float64(failed) / float64(totalTests)
	metrics.Metrics["block_rate"] = float64(blocked) / float64(totalTests)
	metrics.Metrics["skip_rate"] = float64(skipped) / float64(totalTests)
	metrics.Metrics["execution_time"] = results.Duration.Seconds()

	return metrics, nil
}
